Merck Manual

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When Tuberculosis Affects the Skin
When Tuberculosis Affects the Skin
When Tuberculosis Affects the Skin

When tuberculosis spreads to the skin, it may cause painless, firm lumps to form under the skin, as seen in this photo. These lumps eventually enlarge and form open sores. Also, channels may form from the infected area inside the body to the skin's surface.

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Tuberculosis (TB)